@Test
public void testEmptyIsEmpty() {
Observable.<Integer>empty().subscribe(w);
verify(w).onComplete();
verify(w, never()).onNext(any(Integer.class));
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testFirstOfNone() {
Observable<Integer> observable = Observable.empty();
observable.first().subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, never()).onComplete();
verify(w, times(1)).onError(isA(NoSuchElementException.class));
}
@Test
public void testTakeFirstOfNone() {
Observable<Integer> observable = Observable.empty();
observable.take(1).subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, times(1)).onComplete();
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testCountZeroItems() {
Observable<String> observable = Observable.empty();
observable.count().subscribe(w);
// we should be called only once
verify(w, times(1)).onNext(anyLong());
verify(w).onNext(0L);
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testContainsWithEmptyObservable() {
Observable<Boolean> observable = Observable.<String>empty().contains("a");
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext(false);
verify(observer, never()).onNext(true);
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testEmptyIdentity() {
assertEquals(Observable.empty(), Observable.empty());
}